A portable tooth polishing and bleaching treatment system is provided for simultaneous tooth surface polishing and bleaching for use at home or in dental clinics. A full contact swinging mechanism is employed to transfer a continuously rotational input from a motor into a back-and-forth swinging movement output. The system comprises an electrically powered handpiece, a detachable swinging angle, a rubber cup, a user-specific thermoplastic gum protector, and a dual-agent mixing set consisting of a separated storage of polishing bleaching agents and an agent mixing tool. The swinging angle alone is used as a prophylaxis angle for dental clinics.